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The role of the QBO in the inter-hemispheric coupling of summer mesospheric temperatures

Espy, Patrick Joseph; Ochoa, Sara; Forkman, P; Murtagh, D; Stegman, J.
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/2359825
Date
2011
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Original version
Atmospheric Chemistry And Physics 2011, 11(2):495-502   10.5194/acp-11-495-2011
Abstract
Inter-hemispheric coupling between the polar

summer mesosphere and planetary-wave activity in the extratropical

winter stratosphere has recently been inferred using

Polar Mesospheric Cloud (PMC) properties as a proxy

for mesospheric temperature (Karlsson et al., 2007). Here

we confirm these results using a ten-year time series of

July mesospheric temperatures near 60 N derived from the

hydroxyl (OH) nightglow. In addition, we show that the

time-lagged correlation between these summer mesospheric

temperatures and the ECMWF winter stratospheric temperatures

displays a strong Quasi-Biennial Oscillation (QBO).

The sign and phase of the correlation is consistent with the

QBO modulation of the extra-tropical stratospheric dynamics

in the Southern Hemisphere via the Holton-Tan mechanism

(Holton and Tan, 1980). This lends strength to the

identification of synoptic and planetary waves as the driver of

the inter-hemispheric coupling, and results in a strong QBO

modulation of the polar summer mesospheric temperatures.
Publisher
European Geosciences Union
Journal
Atmospheric Chemistry And Physics

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